MICROSTRUCTURAL CHANGE OF NANO-SNO2 GRAIN ASSEMBLAGES WITH THE ANNEALING TEMPERATURE
MICROSTRUCTURAL CHANGE OF NANO-SNO2 GRAIN ASSEMBLAGES WITH THE ANNEALING TEMPERATURE
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DOI：
10.1103/physrevb.55.2666
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发表时间：
1997-01
影响因子：
3.7
通讯作者：
K. N. Yu;Y. Xiong;Y. Xiong;Yu-long Liu;C. Xiong
中科院分区：
文献类型：
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作者：
K. N. Yu;Y. Xiong;Y. Xiong;Yu-long Liu;C. Xiong
用X射线衍射和拉曼光谱系统地研究了纳米SnO_2的微观结构变化。纳米SnO 2颗粒集合体具有金红石结构的某些特征，但在界面和内表面存在大量的氧空位、空位团和晶格局域无序等缺陷，导致晶格畸变，D-4 h（14）空间对称性明显降低，并出现一组新的拉曼峰。发现了两个符合Matossi力常数模型的拉曼主峰N-1和N-2，当退火温度接近673 K时，晶粒中的晶格空位密度和局域晶格无序度迅速降低，晶格畸变和拉曼峰N-1和N-2几乎同时消失。这表明，N-1和N-2峰与纳米团簇颗粒的微观结构变化密切相关，或者说，N-1和N-2峰标志着纳米SnO 2颗粒集合的空间对称性的另一特征。拉曼峰N-3可能与局域SnO 2团簇和空位团簇有关。
The microstructural changes of nano-SnO2 have been systematically studied using x-ray diffraction and Raman spectroscopy. The nano-SnO2 grain assemblage possesses some features of the rutile structure, but has a large amount of defects: vacancies of oxygen, vacancy clusters, and local lattice disorder at the interface and interior surface, which lead to a significant lattice distortion and an evident space-symmetry reduction of D-4h(14) and the appearance of a group of new Raman peaks. Two major Raman peaks N-1 and N-2 in accordance with Matossi's force constant model have been found. When the annealing temperature is close to 673 K, the density of vacant lattice sires and local lattice disorders decreased rapidly in the grains, and the lattice distortion and Raman peaks N-1 and N-2 almost disappeared at the same time. It suggests that N-1 and N-2 are closely related to the microstructural change of the nanocluster grains, or in other words, N-1 and N-2 peaks mark an additional characteristic of space symmetry of the grain assemblage of nano-SnO2. The Raman peak N-3 may be related to local SnO2 clusters and vacancy clusters.